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Other Changes in Plan Assets and Benefit Obligations Recognized in Other Comprehensive Income (Loss) (Detail) (JPY ¥)
In Millions, unless otherwise specified
 12 Months Ended
Mar. 31, 2014
Mar. 31, 2013
Mar. 31, 2012
Domestic Pension Plans Of Foreign Entity Defined Benefit
      
Defined Benefit Plan Disclosure [Line Items]      
Current year actuarial gain (loss) ¥ 1,873 ¥ 7,401 ¥ (5,029)
Amortization of net actuarial loss 777 1,447 1,175
Prior service credit due to amendments 743 0 7
Amortization of prior service credit (1,259) (1,168) (1,193)
Amortization of transition obligation 53 53 53
Plan curtailments and settlements 0 0 18
Total recognized in other comprehensive income (loss), pre-tax 2,187 7,733 (4,969)
Overseas Pension Plans Defined Benefit
      
Defined Benefit Plan Disclosure [Line Items]      
Current year actuarial gain (loss) 2,447 (89) (115)
Amortization of net actuarial loss 60 49 43
Prior service credit due to amendments 344 0 0
Amortization of prior service credit (3) 0 0
Amortization of transition obligation 3 3 3
Foreign currency exchange rate change (7) (213) 19
Total recognized in other comprehensive income (loss), pre-tax ¥ 2,844 ¥ (250) ¥ (50)